Sample Size Calculator
Calculate the required sample size for clinical trials comparing two proportions or two means.
Open Calculator →Power Analysis
Given a sample size, calculate the statistical power of your study to detect a given effect.
Open Calculator →NNT Calculator
Number Needed to Treat, Absolute Risk Reduction, and Relative Risk Reduction with confidence intervals.
Open Calculator →Odds Ratio & Relative Risk
Calculate OR, RR, 95% CI, chi-square test, and Fisher's exact test from a 2×2 table.
Open Calculator →Incidence & Prevalence
Calculate incidence rates, prevalence, and their confidence intervals with Poisson and Wilson methods.
Open Calculator →Chi-Square Test
Chi-square test of independence for contingency tables up to 5×5, with Yates correction and Cramér's V.
Open Calculator →Meta-Analysis Calculator
Pool effect sizes using fixed-effect and random-effects models with forest plot, Q, and I² statistics.
Open Calculator →
Disclaimer: This tool is for educational and research planning purposes. Always consult a biostatistician for clinical trial design.